PHOSPHATE OF SODA. 



57 



It escapes from the body in the fluid (or feces) in which it is 

 formed. For the various forms of its crystals, as found in the urine, 



consult Figs. 6 to 10. 



Fig. 7. 



Crystals of ammonio-magnesian (triple) phosphate, with 

 mucous corpuscles, from catarrh of the bladder. 



Fig. 8 



Fig. 



Stellate crystals of triple phosphate. 



Fig. 10. 



Foliaceous crystals of triple 

 phosphate 



Rosettes of triple phosphate. 



Calculus of triple phos- 

 phate. 



13. The Neutral and Acid Phosphates of Soda. (Na0.2HO.P0 5 + 2HO.) 

 The neutral phosphate is found in all the fluids and solids in the 

 body. Urine normally contains both it and the acid phosphate, the 

 former constituting 2.41 parts in 1,000. (Simon.) In cartilage it 

 constitutes .92, and in woman's milk .04 per 1,000. It is always, 

 in the body, in a state of solution in water ; and this solution be- 

 comes a solvent of the insoluble phosphates and the nitrogenized 

 substances. Thus it has properties analogous to the sulphate of 

 soda. It may also replace the carbonate of soda in the blood, and 

 does so in case of a substitution of animal for vegetable food. 

 It escapes in the urine and the feces, but in the former is con- 



